Genya never socialized much, being alone most of the time and avoiding people mostly, except for when Tanjiro randomly follows him around and tried to get on his good side, but he usually just ignores him

Besides, why would he focus on Tanjiro when he had you waiting for him? Just the thought of getting to see you again after you being gone for a mission makes his heart race, but he had to hide it until he saw you

Once he lost sight of Tanjiro he quickly ran to where you promised to meet him, his heart fluttering when he saw you sitting next to the river, making him smile brightly. That was the thing, only you could truly make his heart race and a smile appear on his usually frowning lips